Wristwatch



FIG. 1 is a front view of my new and ornamental design for a wristwatch;

FIG. 2 is a rear view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a front and right perspective view thereof.

The ornamental design for a wristwatch, as shown and described.